River Crossing anomalies

[TravelTimN]

Fording:

if D < 2.5:
  if BT = 2 (rocky):
    16% of overturning

This isn't possible.
Only the Green and Snake rivers have BT = 2 (rocky).
The Green has a min_depth of 20ft.
The Snake has a min_depth of 6ft.

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Fording:

NOTE: Most of these risks are reduced by 80% if you hire a Native American guide.

You can only hire help at the Snake River Crossing.
However, you cannot select "hire help" and "ford" simultaneously.